Electromagnet.



A. R. TREZIS E, SR.

ELECTROMAGNEL APPLICATION HLEDAUGJ, I9l3.

1,134,779. Patented Apr. 6, 1915.-

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- which trolling system have cores of. the plunger.v

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conrm, or masnr crrr, nnw JERSEY,

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To all whom it may concern:

- which the I smrns PATENT orrrca. v

Be it known that'I, An'rrmn R. Tlmzrsn, Sr., a citizen of the United States, in Brooklyn, in the county of Kings an State of New useful Improvementin Electromagnets, of

following is a specification.

My invention relates to electromagnets having one or more coresof the plunger type, '.and relates more partlcularly to an improved bushing for guiding the cores, and. comprises a tube composed of Scotch glass, which is well known for its s 'ific hardness, which feature makes the adfgta- -tion' thereof for the purpose herein set forth, very desirable.

In electromagnets having a vertically movable core of the plunger type, it has long been observed thatthe tube portion of the magnet spool in which the core is adapted to move, and which generally is made of brass or fiber, offers a considerable amount of resistance to'the movements of the core, due to the fact that the mechanical center of the spool does not coincide with the magnetic center ofthe coil, thus when the magnet coil is energized it causes aside pull on I the core,

which causes the latter to rub against the side of the tube. This continued rubbing 'soon wears grooves in the tube greatly increase the resistance to the movements of the its action extremely slu its movement altogether.

'sh or prevents his defect in the magnet necessitates the replacement thereof.

a new magnet spool and coil, which is y an expensive article of manufacture, and

in an-in'stallation such as an electric elevator installation for example, wherein the electric brake and various switches. of the con-' type, causea great amount of delay in makin a replacement.

In electromagnets havingtwo cores movable longitudinally, the grooves are caused by the weight of sald means comprising -'a tube made. of

Scotch lass, Wind). is well known for its specific ardness, and for its adaptability to withstand variable heat temperatures,

'83., or m Specification ct Rtfil'lltfllt Application filed August 5, 1918. emu Io. 788,1)- I York, have invented anew and core, and either renderssaid cores, which causes. the same to continually rub against the inner movab max, assrenoa room nnnva'r'oa a conrommon or nswmasmr.

.. Anne, 1915.

which are common to direct current magnets and more particularly alternating current magnets. f- I In the accompanying drawings, Figure 1, *shows the application of my invention to an electromagnet havin a single core movable vertically therein; ig. 2 shows the applicatlon of my invention to an electromagnet hav ng two cores therein; Fig. 3 is a glass tube.

In detail the mechanism shown in the draw ngs'comprises a magnet winding 1, contained in a magnet frame 2, which may of any well known construction. A brass tube 3, provided with flan su ports a spool 4 made of fibroid or 0 er suitable insulatmg material. A tube 5, made of Scotch glass the interior of the brass tube 3, to guide the core 6, and is held securely therein b interpose protect same a electromagnet o I provide nuts 9 position.

fragmentary section of a at both ends of the tube 5 to inst mutilation. In an the type shown in Fig. 2, to secure the tube 5 in a nut 9. Rubber washers 8 are movable longitudinally i 68 The advantages obtained by the ada ta- I sistance to the movements of the .core, and r italfords a perfect insulation for the net qualities.

fI ppose to adapt my invention to any 0 now in common use, aving a core or plurality of cores of the plunger type, and therefore wish not to be limlted in its application to elec'tromagnts of theparticuar. construction herein shown.

What I claim and desire to protect by Letters Patent of the United States is 1. In combination, an electromagnet comprising a movable core in plunger form, a member composed of glass the core, and elastic members located at either end of the glass member.

the well known types of electromagnets v a 95. I

coil due to the 'high electric resistance adapted'to guide 2. In combination, an electromagnet coma e core in plun r form, a glass tube e spool to guide the a,magnet coil and spool therefor,"a

positioned inside of -p lu nger form, a member com osed of'Scotch positioned in--the ho ow portion of t e spool, the glass member formedto per- 10 AVAILABLE cow tom-sl sh imam eiieh 'end'of' for. exertin "a pressureon said toretain'the g s the glass tube, and means tube in'position." a

3. An electromagnet compnsln amagnet coil and spool therefor, a mova le' corem free movement of the core therein, and end of the mit a elastic members located at I each glass tube v e 4. An electromagnet compris' amag net coil and spoclfltherefor, a move 10 core in two subscribin new .lilungerforfii, a memter'composedof Scotch 15 glass capable of insertion insldeofthe spool,

said member fdr'medto permit afree'move' ment of the core therem, elastic members ggsitioned on both ends of the glassmem r, and means to retain the latter inits 20' proper position relative to the core. 3

' In' testimony whereof, I have=signed my name to this specification in the presence of witnesses.

AR HUB. R. TREZISI B, SR.

pwitnessesr C.-SrsANe,-

. Jams G. Barnum. 

